I've always been a fan of computer games, and Zelda was one of my favourites.

I know that this photo could be better, the reflection of the room and myself in the piggy bank are not prizewinning additions in this picture.
But I don't want to turn to photoshop. Thing that are there, are there. and things that aren't just aren't. Other photo's from this set-up don't have the reflection, but they have other flaws that are far worse that this, like the little fellow being warped by the curvature of the glass.

if you surround the scene in a poster board paper of your color choice, then you won't have the distracting reflection of the room, and the bank will take on the solid color of the paper. A bounce or diffused light at a angled down position could work well here. In any event, from one Zelda fan to another, I think you've got something really cool already, the dark blue and the flowers and grass really work with the zelda theme, particularly being the cel-shaded version. I'm going to have to scout ebay for one of these piggy banks for my son, where the heck did you find it?